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Journal of Dairy Science Vol. 74 No. 10 3475-3485
© 1991 by American Dairy Science Association ®
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Lactational Performance of High Producing Dairy Cows Fed Diets Containing Salmon Meal and Urea

Paul M. Windschitl 1

1 Agricultural and Forestry Experiment Station, University of Alaska, Palmer 99645

Thirty Holstein cows were used in a 12-wk trial to study the effects of salmon meal and urea on lactational performance. Two experimental diets, one containing 5.6% salmon meal and the other 5.2% salmon meal plus .42% urea, were compared with a soybean meal control diet. Salmon meal and urea replaced a portion of the soybean meal. Dietary undegraded intake protein levels (expressed as percentage of CP) were 28.8, 35.6, and 32.4% for soybean meal, salmon meal, and salmon meal plus urea Total mixed diets (average 17.3% CP, 17.6% ADF) consisting of 60% concentrate mixture and 40% bromegrass silage (DM basis) were fed twice daily. Total DMI was lower with salmon meal compared with soybean meal (20.2 versus 22.2 kg/ d); salmon meal plus urea (21.2 kg/d) was intermediate. Actual milk production was similar for all diets (average 41.1 kg/d). Percentage milk fat and 4% FCM yield were lower with salmon meal (2.56%, 31.6 kg/d) and salmon meal plus urea (2.50%, 31.4 kg/d) than with soybean meal (3.03%, 35.9 kg/d). Gross efficiency (weight FCM/weight DMI) was higher for soybean meal than for salmon meal and salmon meal plus urea Acetate:propionate tended to be higher with the soybean meal diet. The use of a high oil fish meal to provide a source of rumen undegraded intake protein, alone or in combination with urea, resulted in a decrease in milk fat percentage and yield without any beneficial effects on milk production or lactational efficiency.

Key Words: fish meal • undegraded intake protein • lactational response

Submitted on November 13, 1990
Accepted on May 31, 1991




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I. R. Ipharraguerre and J. H. Clark
Impacts of the Source and Amount of Crude Protein on the Intestinal Supply of Nitrogen Fractions and Performance of Dairy Cows
J Dairy Sci, May 1, 2005; 88(e_suppl_1): E22 - E37.
[Abstract] [Full Text] [PDF]


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Copyright © 1991 by the American Dairy Science Association ®.